diff options
Diffstat (limited to 'fs/xfs/xfs_bmap_item.c')
| -rw-r--r-- | fs/xfs/xfs_bmap_item.c | 374 |
1 files changed, 374 insertions, 0 deletions
diff --git a/fs/xfs/xfs_bmap_item.c b/fs/xfs/xfs_bmap_item.c new file mode 100644 index 000000000000..ea736af649de --- /dev/null +++ b/fs/xfs/xfs_bmap_item.c @@ -0,0 +1,374 @@ +/* + * Copyright (C) 2016 Oracle. All Rights Reserved. + * + * Author: Darrick J. Wong <darrick.wong@oracle.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_mount.h" +#include "xfs_trans.h" +#include "xfs_trans_priv.h" +#include "xfs_buf_item.h" +#include "xfs_bmap_item.h" +#include "xfs_log.h" + + +kmem_zone_t *xfs_bui_zone; +kmem_zone_t *xfs_bud_zone; + +static inline struct xfs_bui_log_item *BUI_ITEM(struct xfs_log_item *lip) +{ + return container_of(lip, struct xfs_bui_log_item, bui_item); +} + +void +xfs_bui_item_free( + struct xfs_bui_log_item *buip) +{ + kmem_zone_free(xfs_bui_zone, buip); +} + +STATIC void +xfs_bui_item_size( + struct xfs_log_item *lip, + int *nvecs, + int *nbytes) +{ + struct xfs_bui_log_item *buip = BUI_ITEM(lip); + + *nvecs += 1; + *nbytes += xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents); +} + +/* + * This is called to fill in the vector of log iovecs for the + * given bui log item. We use only 1 iovec, and we point that + * at the bui_log_format structure embedded in the bui item. + * It is at this point that we assert that all of the extent + * slots in the bui item have been filled. + */ +STATIC void +xfs_bui_item_format( + struct xfs_log_item *lip, + struct xfs_log_vec *lv) +{ + struct xfs_bui_log_item *buip = BUI_ITEM(lip); + struct xfs_log_iovec *vecp = NULL; + + ASSERT(atomic_read(&buip->bui_next_extent) == + buip->bui_format.bui_nextents); + + buip->bui_format.bui_type = XFS_LI_BUI; + buip->bui_format.bui_size = 1; + + xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUI_FORMAT, &buip->bui_format, + xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents)); +} + +/* + * Pinning has no meaning for an bui item, so just return. + */ +STATIC void +xfs_bui_item_pin( + struct xfs_log_item *lip) +{ +} + +/* + * The unpin operation is the last place an BUI is manipulated in the log. It is + * either inserted in the AIL or aborted in the event of a log I/O error. In + * either case, the BUI transaction has been successfully committed to make it + * this far. Therefore, we expect whoever committed the BUI to either construct + * and commit the BUD or drop the BUD's reference in the event of error. Simply + * drop the log's BUI reference now that the log is done with it. + */ +STATIC void +xfs_bui_item_unpin( + struct xfs_log_item *lip, + int remove) +{ + struct xfs_bui_log_item *buip = BUI_ITEM(lip); + + xfs_bui_release(buip); +} + +/* + * BUI items have no locking or pushing. However, since BUIs are pulled from + * the AIL when their corresponding BUDs are committed to disk, their situation + * is very similar to being pinned. Return XFS_ITEM_PINNED so that the caller + * will eventually flush the log. This should help in getting the BUI out of + * the AIL. + */ +STATIC uint +xfs_bui_item_push( + struct xfs_log_item *lip, + struct list_head *buffer_list) +{ + return XFS_ITEM_PINNED; +} + +/* + * The BUI has been either committed or aborted if the transaction has been + * cancelled. If the transaction was cancelled, an BUD isn't going to be + * constructed and thus we free the BUI here directly. + */ +STATIC void +xfs_bui_item_unlock( + struct xfs_log_item *lip) +{ + if (lip->li_flags & XFS_LI_ABORTED) + xfs_bui_item_free(BUI_ITEM(lip)); +} + +/* + * The BUI is logged only once and cannot be moved in the log, so simply return + * the lsn at which it's been logged. + */ +STATIC xfs_lsn_t +xfs_bui_item_committed( + struct xfs_log_item *lip, + xfs_lsn_t lsn) +{ + return lsn; +} + +/* + * The BUI dependency tracking op doesn't do squat. It can't because + * it doesn't know where the free extent is coming from. The dependency + * tracking has to be handled by the "enclosing" metadata object. For + * example, for inodes, the inode is locked throughout the extent freeing + * so the dependency should be recorded there. + */ +STATIC void +xfs_bui_item_committing( + struct xfs_log_item *lip, + xfs_lsn_t lsn) +{ +} + +/* + * This is the ops vector shared by all bui log items. + */ +static const struct xfs_item_ops xfs_bui_item_ops = { + .iop_size = xfs_bui_item_size, + .iop_format = xfs_bui_item_format, + .iop_pin = xfs_bui_item_pin, + .iop_unpin = xfs_bui_item_unpin, + .iop_unlock = xfs_bui_item_unlock, + .iop_committed = xfs_bui_item_committed, + .iop_push = xfs_bui_item_push, + .iop_committing = xfs_bui_item_committing, +}; + +/* + * Allocate and initialize an bui item with the given number of extents. + */ +struct xfs_bui_log_item * +xfs_bui_init( + struct xfs_mount *mp) + +{ + struct xfs_bui_log_item *buip; + + buip = kmem_zone_zalloc(xfs_bui_zone, KM_SLEEP); + + xfs_log_item_init(mp, &buip->bui_item, XFS_LI_BUI, &xfs_bui_item_ops); + buip->bui_format.bui_nextents = XFS_BUI_MAX_FAST_EXTENTS; + buip->bui_format.bui_id = (uintptr_t)(void *)buip; + atomic_set(&buip->bui_next_extent, 0); + atomic_set(&buip->bui_refcount, 2); + + return buip; +} + +/* + * Freeing the BUI requires that we remove it from the AIL if it has already + * been placed there. However, the BUI may not yet have been placed in the AIL + * when called by xfs_bui_release() from BUD processing due to the ordering of + * committed vs unpin operations in bulk insert operations. Hence the reference + * count to ensure only the last caller frees the BUI. + */ +void +xfs_bui_release( + struct xfs_bui_log_item *buip) +{ + if (atomic_dec_and_test(&buip->bui_refcount)) { + xfs_trans_ail_remove(&buip->bui_item, SHUTDOWN_LOG_IO_ERROR); + xfs_bui_item_free(buip); + } +} + +static inline struct xfs_bud_log_item *BUD_ITEM(struct xfs_log_item *lip) +{ + return container_of(lip, struct xfs_bud_log_item, bud_item); +} + +STATIC void +xfs_bud_item_size( + struct xfs_log_item *lip, + int *nvecs, + int *nbytes) +{ + *nvecs += 1; + *nbytes += sizeof(struct xfs_bud_log_format); +} + +/* + * This is called to fill in the vector of log iovecs for the + * given bud log item. We use only 1 iovec, and we point that + * at the bud_log_format structure embedded in the bud item. + * It is at this point that we assert that all of the extent + * slots in the bud item have been filled. + */ +STATIC void +xfs_bud_item_format( + struct xfs_log_item *lip, + struct xfs_log_vec *lv) +{ + struct xfs_bud_log_item *budp = BUD_ITEM(lip); + struct xfs_log_iovec *vecp = NULL; + + budp->bud_format.bud_type = XFS_LI_BUD; + budp->bud_format.bud_size = 1; + + xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUD_FORMAT, &budp->bud_format, + sizeof(struct xfs_bud_log_format)); +} + +/* + * Pinning has no meaning for an bud item, so just return. + */ +STATIC void +xfs_bud_item_pin( + struct xfs_log_item *lip) +{ +} + +/* + * Since pinning has no meaning for an bud item, unpinning does + * not either. + */ +STATIC void +xfs_bud_item_unpin( + struct xfs_log_item *lip, + int remove) +{ +} + +/* + * There isn't much you can do to push on an bud item. It is simply stuck + * waiting for the log to be flushed to disk. + */ +STATIC uint +xfs_bud_item_push( + struct xfs_log_item *lip, + struct list_head *buffer_list) +{ + return XFS_ITEM_PINNED; +} + +/* + * The BUD is either committed or aborted if the transaction is cancelled. If + * the transaction is cancelled, drop our reference to the BUI and free the + * BUD. + */ +STATIC void +xfs_bud_item_unlock( + struct xfs_log_item *lip) +{ + struct xfs_bud_log_item *budp = BUD_ITEM(lip); + + if (lip->li_flags & XFS_LI_ABORTED) { + xfs_bui_release(budp->bud_buip); + kmem_zone_free(xfs_bud_zone, budp); + } +} + +/* + * When the bud item is committed to disk, all we need to do is delete our + * reference to our partner bui item and then free ourselves. Since we're + * freeing ourselves we must return -1 to keep the transaction code from + * further referencing this item. + */ +STATIC xfs_lsn_t +xfs_bud_item_committed( + struct xfs_log_item *lip, + xfs_lsn_t lsn) +{ + struct xfs_bud_log_item *budp = BUD_ITEM(lip); + + /* + * Drop the BUI reference regardless of whether the BUD has been + * aborted. Once the BUD transaction is constructed, it is the sole + * responsibility of the BUD to release the BUI (even if the BUI is + * aborted due to log I/O error). + */ + xfs_bui_release(budp->bud_buip); + kmem_zone_free(xfs_bud_zone, budp); + + return (xfs_lsn_t)-1; +} + +/* + * The BUD dependency tracking op doesn't do squat. It can't because + * it doesn't know where the free extent is coming from. The dependency + * tracking has to be handled by the "enclosing" metadata object. For + * example, for inodes, the inode is locked throughout the extent freeing + * so the dependency should be recorded there. + */ +STATIC void +xfs_bud_item_committing( + struct xfs_log_item *lip, + xfs_lsn_t lsn) +{ +} + +/* + * This is the ops vector shared by all bud log items. + */ +static const struct xfs_item_ops xfs_bud_item_ops = { + .iop_size = xfs_bud_item_size, + .iop_format = xfs_bud_item_format, + .iop_pin = xfs_bud_item_pin, + .iop_unpin = xfs_bud_item_unpin, + .iop_unlock = xfs_bud_item_unlock, + .iop_committed = xfs_bud_item_committed, + .iop_push = xfs_bud_item_push, + .iop_committing = xfs_bud_item_committing, +}; + +/* + * Allocate and initialize an bud item with the given number of extents. + */ +struct xfs_bud_log_item * +xfs_bud_init( + struct xfs_mount *mp, + struct xfs_bui_log_item *buip) + +{ + struct xfs_bud_log_item *budp; + + budp = kmem_zone_zalloc(xfs_bud_zone, KM_SLEEP); + xfs_log_item_init(mp, &budp->bud_item, XFS_LI_BUD, &xfs_bud_item_ops); + budp->bud_buip = buip; + budp->bud_format.bud_bui_id = buip->bui_format.bui_id; + + return budp; +} |